SaveCalculator

If there are frequently used or important numbers, press "Save Number" to save those numbers. Then, a number button will show up below the screen. Rather thatn pressing the numbers each time, simply click on the button, and the calculation becomes much easier. You can save up to 12 numbers in maximum.
When you need to remove the saved number, press "Delete Number". Then, a red line will surround the "Delete Number" button. Then, click on the number you want to remove, and it will be erased. After you remove a number, press the "Delete Number" button again, and the red border lines will disappear. In the upper left of your screen, press the arrow sign to check your previous calculation records.